Most float on water only a short time before they tire, sink, and drown.
大多数浮在水面上的时间很短，之后它们就会疲劳、下沉、淹死。
There is running water only every other day because the pumping station requires electricity.
因为抽水站需要用电，自来水每隔一天才来。
Lacking an outlet, the Caspian Sea loses water only by evaporation, leading to the accumulation of salt.
由于没有排水口，里海的水量流失只能依赖蒸发，这也造成湖水中盐的积聚。
Ephemeral Lake Carnegie, in Western Australia, fills with water only during periods of significant rainfall.
短命的卡内基湖，位于西澳大利亚，只在重要的降雨时期充满水。
Ephemeral Lake Carnegie, in Western Australia, fills with water only during periods of significant rainfall. In dry years, it is reduced to a muddy marsh.
短命的卡内基湖，位于西澳大利亚，只在重要的降雨时期充满水。在干旱的年份里，它就变成了一个泥沼。
And whosoever shall give to drink unto one of these little ones a cup of cold water only in the name of a disciple, verily I say unto you, he shall in no wise lose his reward.
无论何人，因为门徒的名，只把一杯凉水给这小子里的一个喝，我实在告诉你们，这人不能不得赏赐。
Even then, the penguins are cautious; they stay in the water only long enough to feed, and they're adept at remaining motionless when they're on thin ice and spot a leopard seal.
尽管如此，企鹅也十分谨慎：它们仅仅在捕食时才呆在水下；一旦意识到冰面很薄或是附近出现海豹，它们就会紧紧地趴在冰面上，一动不动。
Only drink bottled water and check the seal isn't broken.
只喝瓶装水，并且要看封口开了没有。
The Martian atmosphere contains only tiny amounts of water.
火星的大气层只含有微量的水。
A child can drown in only a few inches of water.
儿童在仅仅几英寸深的水中就能溺死。
The best prevention for cholera is to boil or filter water, and eat only well-cooked food.
预防霍乱最好的方法是把水煮沸或过滤，并且只吃煮熟的食物。
The silence was broken only by the steady drip, drip of water from the roof.
只有屋顶上滴答滴答持续不断的滴水声打破了寂静。
During his journey, he only took water, food and sleeping bags.
在旅途中，他只带了水、食物和睡袋。
Radars used to track storms can detect water in the atmosphere only once it has condensed into clouds or raindrops.
用于跟踪风暴的雷达只能在大气中凝结成云或雨滴后才能够探测到水。
Such actions as discharging waste water to rivers not only pollute the environment but also become a danger to people's health.
像排放污水这样的行为不仅污染了环境，还成为了人民健康的威胁。
水只有齐膝深。
Rain water will only percolate through slowly.
雨水只会慢慢地渗进来。
The water is only a few inches deep.
这水只有几英寸深。
The water was only waist-deep so I walked ashore.
水只有齐腰深，所以我涉水上了岸。
They have only a vague idea of the amount of water available.
他们对于可用水量只有一点模糊的了解。
The shower is easy to install – it needs only to be connected up to the hot and cold water supply.
淋浴器很容易安装–只需接上冷热水即可。
Only a third of these households thought it reasonable to meter water.
这些用户中只有1/3认为用水表计量是合理的。
Early life-forms on Earth were confined to the oceans because water was the only available protection they had against ultraviolet radiation.
地球上早期的生命形式被限制在海洋里，因为水是帮助它们抵御紫外线辐射的唯一有效保护。
You might wonder how we can tell whether fossil animals lived on land or in water, especially if only fragments are found.
你可能想知道我们如何分辨化石上的动物是生活在陆地上还是水里，特别是如果只发现了化石碎片。
We all know that though 75% of the earth is covered with water, only 3% of it is fresh water.
我们都知道虽然地球75%都被水覆盖，但是其中只有3%是淡水。
While 75% of our planet is covered with water, only about 2% is fresh water that comes from rivers, lakes, ice and snow.
虽然地球的75%被水覆盖，但只有大约2%是来自河流、湖泊、冰雪的淡水。
You only have water to serve your guests?
你只有饮用水来招待客人吗？
There was no bridge before. And the island could only be reached by water.
以前没有桥。想去岛上只能走水路。
Paradoxically, while the temperatures required for liquid water exist only in the inner solar system, the key building blocks of life, including water itself, occur primarily beyond the asteroid belt.
矛盾的是，虽然液态水所需的温度只存在于太阳系内部，但生命的关键组成部分，包括水本身，却主要存在于小行星带之外。
Paradoxically, while the temperatures required for liquid water exist only in the inner solar system, the key building blocks of life, including water itself, occur primarily beyond the asteroid belt.
矛盾的是，虽然液态水所需的温度只存在于太阳系内部，但生命的关键组成部分，包括水本身，却主要存在于小行星带之外。
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